Reliability analysis of ballastless track based on a stochastic finite element method

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 239-244.

LI Zaiwei1, ZHANG Bin2, LEI Xiaoyan2, GAO Liang3

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Abstract

The reliability of ballastless track structure is one of the key factors that affect the safety of high-speed trains. The influence of track irregularity on the reliability of ballastless track was analyzed by a hybrid modeling method of stochastic finite element and artificial intelligence. The limit state equation of service safety of ballastless track was established by random factors of wheel rail coupling dynamics. The CRTS II slab track unit model and the CRH 3 vehicle unit model were established by the finite element method and solved by a cross iteration method. The measured track irregularities were taken as input and the wheel rail dynamic response was taken as the output. The three-layer BP neural network model was used to map the wheel-rail relationship which was used to calculate the effect of track irregularities and the reliability index by a finite element Monte Carlo method. The fitting and inversion of the track spectrum were using the measured track irregularities data. The results of the hybrid modeling and the traditional calculation were compared and analyzed. The results indicate that the condition of the ballastless track can be evaluated by the hybrid modeling method, the exist ballastless track structure of high speed railway satisfies the safety requirement of high speed trains. The probabilistic analysis should be considered in track structural design and railway maintenance. 

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track irregularity / ballastless track / Finite Element Method / Monte Carlo method / BP neural network / probability of failure

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LI Zaiwei1, ZHANG Bin2, LEI Xiaoyan2, GAO Liang3. Reliability analysis of ballastless track based on a stochastic finite element method[J]. Journal of Vibration and Shock, 2019, 38(16): 239-244

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